[ErkanTR16]

Originally Posted by BrettKA7

My friend who knows about my valve cover / PCV failure sent me a video that I suppose looks like ANOTHER valve cover failure from a random M240i owner. Here are a couple screen grabs.

Yep... I'm having the same issue on my 2018 340i. I went in for an oil change and the dealer noticed smoke and oil coming from the exhaust. They said the valve cover and the oil separator needed to be changed. Total cost $2544.

My car in bone stock at 55K miles. Maintenance is regularly done at the dealership. Luckily they are willing to cover the replacement parts and labor at goodwill.

I still don't understand how something like this can happen. No tune no mods daily driven..

[weehe126]

It's a failed PCV, has nothing to do with power. It's a normal maintenance item for almost every car. BMW just made it an issue by integrating it into the valve cover.

[G.Newt]

That's why I bought a PCV repair kit for $40 with a new cap/diaphragm/spring/plastic insert just in case this happens.

[cfm56d7b]

Originally Posted by G.Newt

That's why I bought a PCV repair kit for $40 with a new cap/diaphragm/spring/plastic insert just in case this happens.

Where did you buy the PCV repair kit?

[G.Newt]

Originally Posted by cfm56d7b

Where did you buy the PCV repair kit?

From eBay! There's some without the cap, but in case you destroy yours you don't have to worry cuz I've heard it's hard to take off.

[midxotic]

3 months of ownership so far with my 2018 340i, no issues yet. Enjoying every moment However, I definitely need to get rid of the run flats and factory 0w20.

[Nickski06]

I've had my 2016 for 2 1/2 years so far and at 62,000 miles. It's had an AP intake and JB4 on map 3 (+6 psi) and running E20 for about a year now. I've had zero issues with this other than I added some coolant about a year ago. I used to have that well known mystery squeak on hard shifts when it's warm out. What doesn't make sense is since I've had my JB4 and it's making more power, I haven't heard that anymore. No clue on that one, I figured more power would make it worse.

[_N54]

Originally Posted by Sensational

2018 440i 30k~ miles
Mods: e50 tune, catless dp, supra fuel pump, mst intake

Car misfires on idle in cylinder 1 and also has very rough idle until that cylinder misfires. Also will misfire during the engine start up.
Only codes I get are for cylinder 1 misfiring and then going into limp mode/shutting off injector 1.
There's no white smoke or fuel leaking from exhaust or injectors.

So far whats been tried:

MYSELF:
Sparkplugs replaced
Coils replaced
Injector 1 replaced
Compression Test

DEALER:
Sparkplugs replaced
Coils replaced
Injector replaced(not warrentied)
Compression Test
Voltage test on dme - They found a short in the circuit for cylinder 1 reccomened i replace the dme as dealer does not repair dmes. Also not warrentied.

Shop with certified bmw techs
Checked sparkplugs, injector, coils
Visual on cylinder one and compression test
replaced old dme with cloned donor dme

So far nothing has worked.

Third party shop is now wanting to do a engine tear down to see what could possible be wrong.
Im completely lost as dme replacement was pretty much the last resort when trying to figure out this issue. Our only guess now is something somewhere has been knocked out of place or scratched or scorn but basically to see such a thing the engine would need to be torn down and inspected.
Taking it back to dealer to see what they come up with.

If anyone has had a similar misfire issue and compression checks out, while replacing spark coil injector and dme did not fix the issue please let me know.

Again the only symptoms are misfire on cylinder one and rough idle. No smoke, no smell, no raw fuel.

Im also guessing the e50 fuel played some huge part but i cant figure out myself what the fuel could have messed up.

Hopefully you don't need a new engine from a scored cylinder wall due to a leaking injector. Mine did the same, but got severe and started smoking. Compression would pass surprisingly, but leak down didn't. Remove your oil filter and inspect it for metal.

[Sleeper340i]

2016 340i. Mods: Pure 800, catless downpipe, intake, XHP stage 3, custom tuned on E50

Around 63k miles currently and my daily driver. Was driving last weekend and did a couple pulls. On my second pull felt something a little rough at the end then got a drivetrain message. Right after my car kept vibrating badly when giving any throttle, came to a stop and the vibration became worse( so I pulled over at a parking lot, turned off the car and scanned with MHD, got codes about misfires in cylinder 3 and 5. Let it rest a bit and cleared the codes and luckily the issue did not occur again and was able to drive home.

This was the first time I ever had a misfire. Upon some research seems like could be spark plugs or coil packs. Changed my spark plugs about 1-2k miles ago though but there was some oil on my spark plug 5 when changing so it could have got oil in there again. Also been having a decent oil leak somewhere, losing 1 quart every few weeks to a month. Hoping injectors didn't go bad, but won't be surprised if it is as I did have a very weird burning smell in the cabin a few hours before the pulls when going home.

[M140_BCS]

I've had the same issue on a 4th gear pull back in April. Cleared the codes and never had it since.

Was running MHD Stage 1 E30 map at the time, thought it might be down to only having 10 litres of fuel in the tank.

What was your fuel level at the time?

[Sleeper340i]

Originally Posted by M140_BCS

I've had the same issue on a 4th gear pull back in April. Cleared the codes and never had it since.

Was running MHD Stage 1 E30 map at the time, thought it might be down to only having 10 litres of fuel in the tank.

What was your fuel level at the time?

Interesting… My codes look about the same and I had around 10-12.5L left. Wouldn't have expected any issue with the fuel level unless the fuel level light had went off.

Did you have the cabin burning smell with yours though when driving prior to the pull?

[M140_BCS]

Originally Posted by Sleeper340i

Interesting… My codes look about the same and I had around 10-12.5L left. Wouldn't have expected any issue with the fuel level unless the fuel level light had went off.

Did you have the cabin burning smell with yours though when driving prior to the pull?

No burning smells or any other issues in the 2 years I've had the 440i

Mileage is 58k miles.

[G.Newt]

Originally Posted by Sleeper340i

2016 340i. Mods: Pure 800, catless downpipe, intake, XHP stage 3, custom tuned on E50

Around 63k miles currently and my daily driver. Was driving last weekend and did a couple pulls. On my second pull felt something a little rough at the end then got a drivetrain message. Right after my car kept vibrating badly when giving any throttle, came to a stop and the vibration became worse( so I pulled over at a parking lot, turned off the car and scanned with MHD, got codes about misfires in cylinder 3 and 5. Let it rest a bit and cleared the codes and luckily the issue did not occur again and was able to drive home.

This was the first time I ever had a misfire. Upon some research seems like could be spark plugs or coil packs. Changed my spark plugs about 1-2k miles ago though but there was some oil on my spark plug 5 when changing so it could have got oil in there again. Also been having a decent oil leak somewhere, losing 1 quart every few weeks to a month. Hoping injectors didn't go bad, but won't be surprised if it is as I did have a very weird burning smell in the cabin a few hours before the pulls when going home.

Keep us updated as you diagnose the issue. Hoping it's not a leaky injector causing you to have blowby after a scored cylinder wall.

[Sleeper340i]

Originally Posted by G.Newt

Keep us updated as you diagnose the issue. Hoping it's not a leaky injector causing you to have blowby after a scored cylinder wall.

Hoping not! Going to to replace my leaky valve cover gasket and then replace my spark plug and coil pack after. Have smelt a bunch of weird smells in cabin before but hoping it's not from the injectors and the oil from valve cover gasket leak being burnt

From what I've seen here on the forums if leaky injectors usually you get smoke from the exhaust?

[Sleeper340i]

Update: Car started vibrating upon putting in regular gas last night from the e50 blend and it wouldn't stop but when driving the vibration went away. Tuner believes it's one or two stuck open/closed injectors so going to have the shop check that out first.

[B58togo]

Problem free until the stock turbo decided to let go at 63,xxx miles. I was on a custom F80 Paul E40 tune for the last 15k or so. Prior to that it was OTS E30 for around 8k, and about 5k on OTS Stg 2 93 for 5k. JB4 was on from 1,200 to around 35,000. Wanted to go Pure 800, but with the backorder/summer shutdown, that wasn’t gonna fly. Ordered a VTT and was only down for a few weeks. I was going to upgrade very soon anyway.

[Sleeper340i]

Update: Looks like I need a new engine. Compression was low by 20 and Pistons rings failed which caused oil to leak into my cylinder 3 and the wall was scored.

Debating of even engine swapping another Gen1 B58 as I wouldn't want something like this to happen again:

[G.Newt]

Originally Posted by Sleeper340i

Update: Looks like I need a new engine. Compression was low by 20 and Pistons rings failed which caused oil to leak into my cylinder 3 and the wall was scored.

Debating of even engine swapping another Gen1 B58 as I wouldn't want something like this to happen again:

Injectors were okay? Sorry to hear that man. If you're dong an engine swap, you could upgrade the pistons at the same time, as those are the weakest point.

[Sleeper340i]

Originally Posted by G.Newt

Injectors were okay? Sorry to hear that man. If you're dong an engine swap, you could upgrade the pistons at the same time, as those are the weakest point.

Appreciate it man. Really learning the true meaning of pay to play with my first fast car

So we never actually got to checking the injectors unfortunately, which was actually next on the list before I found out my engine was screwed. But from the scoring lines that were seen my tuner believes it might have been caused from brief overheating causing friction from the piston ring which transferred to the pistons to possibly snap the piston ring land. Also I wouldn't count the injectors out as part of the reason due to all the injector failure symptoms I was getting as it seemed like my plugs and coils were fine upon inspection to my shop.

I'll definitely keep that upgraded piston in mind! Never really considered it before to be honest but with this happening seems like it's fair game for anything to happen now.

Also as a note, my car had been leaking for probably about almost a year now which Is when the piston ring land issue occurred I would assume. I was running my First Pure 800 92 time for about 6 months prior to the leak first occurring. Had about -4 to -7 corrections on WOT so maybe that played a factor driving for a period of time like that.

[E92Vancouver]

Originally Posted by B58

B58 vanos and timing is much more advanced then the previous bmw models. I wouldn't worry too much about it and lose sleep over your engine having to come out in the future lol. There are N54's with 150,000 miles that never suffered such an issue with vanos and timing chains. I'm not sure what there is to service a timing chain? I don't recall a chain stretching or snapping like timing belts and I'm sure the chain tensioners are very modern and much more advanced.

Timing chains only last the life of the engine if you change the oil regularly. If you don' the chain stretches (actually rollers wear out not actually chain stretch) which wears out the camshaft gears.

[MezcalB58F30]

2016 BMW 340i RWD
Has anybody else had starting issues after driving in sport+ for an extended period of time?
About a month ago, after turning off the car from a nice heavy drive under sport+, the car would struggle to start. It would crank but not turn over. I waited about one hour once for the car to be able to start. I tried pulling some codes and I only have a code for a minor leak in the EVAP system. Can this be causing the starting issue?
-battery checked, running at 12.3V. It is a 5 year old battery now so will be replacing soon.
-starter seems to be working fine
-alternator is working as it shouldn’t as well. Voltage while driving is 14V plus
Any ideas as to what might be causing this issue? Other than that the car drives like a beast.

[eluded]

Originally Posted by MezcalB58F30

Has anybody else had starting issues after driving in sport+ for an extended period of time?

No